include/linux/percpu.h

   1 #ifndef __LINUX_PERCPU_H
   2 #define __LINUX_PERCPU_H
   3
   4 #include <linux/preempt.h>
   5 #include <linux/smp.h>
   6 #include <linux/cpumask.h>
   7 #include <linux/pfn.h>
   8 #include <linux/init.h>
   9
  10 #include <asm/percpu.h>
  11
  12 /* enough to cover all DEFINE_PER_CPUs in modules */
  13 #ifdef CONFIG_MODULES
  14 #define PERCPU_MODULE_RESERVE           (8 << 10)
  15 #else
  16 #define PERCPU_MODULE_RESERVE           0
  17 #endif
  18
  19 #ifndef PERCPU_ENOUGH_ROOM
  20 #define PERCPU_ENOUGH_ROOM                                              \
  21         (ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES) +      \
  22          PERCPU_MODULE_RESERVE)
  23 #endif
  24
  25 /*
  26  * Must be an lvalue. Since @var must be a simple identifier,
  27  * we force a syntax error here if it isn't.
  28  */
  29 #define get_cpu_var(var) (*({                           \
  30         preempt_disable();                              \
  31         &__get_cpu_var(var); }))
  32
  33 /*
  34  * The weird & is necessary because sparse considers (void)(var) to be
  35  * a direct dereference of percpu variable (var).
  36  */
  37 #define put_cpu_var(var) do {                           \
  38         (void)&(var);                                   \
  39         preempt_enable();                               \
  40 } while (0)
  41
  42 #define get_cpu_ptr(var) ({                             \
  43         preempt_disable();                              \
  44         this_cpu_ptr(var); })
  45
  46 #define put_cpu_ptr(var) do {                           \
  47         (void)(var);                                    \
  48         preempt_enable();                               \
  49 } while (0)
  50
  51 /* minimum unit size, also is the maximum supported allocation size */
  52 #define PCPU_MIN_UNIT_SIZE              PFN_ALIGN(32 << 10)
  53
  54 /*
  55  * Percpu allocator can serve percpu allocations before slab is
  56  * initialized which allows slab to depend on the percpu allocator.
  57  * The following two parameters decide how much resource to
  58  * preallocate for this.  Keep PERCPU_DYNAMIC_RESERVE equal to or
  59  * larger than PERCPU_DYNAMIC_EARLY_SIZE.
  60  */
  61 #define PERCPU_DYNAMIC_EARLY_SLOTS      128
  62 #define PERCPU_DYNAMIC_EARLY_SIZE       (12 << 10)
  63
  64 /*
  65  * PERCPU_DYNAMIC_RESERVE indicates the amount of free area to piggy
  66  * back on the first chunk for dynamic percpu allocation if arch is
  67  * manually allocating and mapping it for faster access (as a part of
  68  * large page mapping for example).
  69  *
  70  * The following values give between one and two pages of free space
  71  * after typical minimal boot (2-way SMP, single disk and NIC) with
  72  * both defconfig and a distro config on x86_64 and 32.  More
  73  * intelligent way to determine this would be nice.
  74  */
  75 #if BITS_PER_LONG > 32
  76 #define PERCPU_DYNAMIC_RESERVE          (20 << 10)
  77 #else
  78 #define PERCPU_DYNAMIC_RESERVE          (12 << 10)
  79 #endif
  80
  81 extern void *pcpu_base_addr;
  82 extern const unsigned long *pcpu_unit_offsets;
  83
  84 struct pcpu_group_info {
  85         int                     nr_units;       /* aligned # of units */
  86         unsigned long           base_offset;    /* base address offset */
  87         unsigned int            *cpu_map;       /* unit->cpu map, empty
  88                                                  * entries contain NR_CPUS */
  89 };
  90
  91 struct pcpu_alloc_info {
  92         size_t                  static_size;
  93         size_t                  reserved_size;
  94         size_t                  dyn_size;
  95         size_t                  unit_size;
  96         size_t                  atom_size;
  97         size_t                  alloc_size;
  98         size_t                  __ai_size;      /* internal, don't use */
  99         int                     nr_groups;      /* 0 if grouping unnecessary */
 100         struct pcpu_group_info  groups[];
 101 };
 102
 103 enum pcpu_fc {
 104         PCPU_FC_AUTO,
 105         PCPU_FC_EMBED,
 106         PCPU_FC_PAGE,
 107
 108         PCPU_FC_NR,
 109 };
 110 extern const char *pcpu_fc_names[PCPU_FC_NR];
 111
 112 extern enum pcpu_fc pcpu_chosen_fc;
 113
 114 typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size,
 115                                      size_t align);
 116 typedef void (*pcpu_fc_free_fn_t)(void *ptr, size_t size);
 117 typedef void (*pcpu_fc_populate_pte_fn_t)(unsigned long addr);
 118 typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to);
 119
 120 extern struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups,
 121                                                              int nr_units);
 122 extern void __init pcpu_free_alloc_info(struct pcpu_alloc_info *ai);
 123
 124 extern int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
 125                                          void *base_addr);
 126
 127 #ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK
 128 extern int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size,
 129                                 size_t atom_size,
 130                                 pcpu_fc_cpu_distance_fn_t cpu_distance_fn,
 131                                 pcpu_fc_alloc_fn_t alloc_fn,
 132                                 pcpu_fc_free_fn_t free_fn);
 133 #endif
 134
 135 #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
 136 extern int __init pcpu_page_first_chunk(size_t reserved_size,
 137                                 pcpu_fc_alloc_fn_t alloc_fn,
 138                                 pcpu_fc_free_fn_t free_fn,
 139                                 pcpu_fc_populate_pte_fn_t populate_pte_fn);
 140 #endif
 141
 142 /*
 143  * Use this to get to a cpu's version of the per-cpu object
 144  * dynamically allocated. Non-atomic access to the current CPU's
 145  * version should probably be combined with get_cpu()/put_cpu().
 146  */
 147 #ifdef CONFIG_SMP
 148 #define per_cpu_ptr(ptr, cpu)   SHIFT_PERCPU_PTR((ptr), per_cpu_offset((cpu)))
 149 #else
 150 #define per_cpu_ptr(ptr, cpu)   ({ (void)(cpu); VERIFY_PERCPU_PTR((ptr)); })
 151 #endif
 152
 153 extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align);
 154 extern bool is_kernel_percpu_address(unsigned long addr);
 155
 156 #if !defined(CONFIG_SMP) || !defined(CONFIG_HAVE_SETUP_PER_CPU_AREA)
 157 extern void __init setup_per_cpu_areas(void);
 158 #endif
 159 extern void __init percpu_init_late(void);
 160
 161 extern void __percpu *__alloc_percpu(size_t size, size_t align);
 162 extern void free_percpu(void __percpu *__pdata);
 163 extern phys_addr_t per_cpu_ptr_to_phys(void *addr);
 164
 165 #define alloc_percpu(type)      \
 166         (typeof(type) __percpu *)__alloc_percpu(sizeof(type), __alignof__(type))
 167
 168 /*
 169  * Optional methods for optimized non-lvalue per-cpu variable access.
 170  *
 171  * @var can be a percpu variable or a field of it and its size should
 172  * equal char, int or long.  percpu_read() evaluates to a lvalue and
 173  * all others to void.
 174  *
 175  * These operations are guaranteed to be atomic w.r.t. preemption.
 176  * The generic versions use plain get/put_cpu_var().  Archs are
 177  * encouraged to implement single-instruction alternatives which don't
 178  * require preemption protection.
 179  */
 180 #ifndef percpu_read
 181 # define percpu_read(var)                                               \
 182   ({                                                                    \
 183         typeof(var) *pr_ptr__ = &(var);                                 \
 184         typeof(var) pr_ret__;                                           \
 185         pr_ret__ = get_cpu_var(*pr_ptr__);                              \
 186         put_cpu_var(*pr_ptr__);                                         \
 187         pr_ret__;                                                       \
 188   })
 189 #endif
 190
 191 #define __percpu_generic_to_op(var, val, op)                            \
 192 do {                                                                    \
 193         typeof(var) *pgto_ptr__ = &(var);                               \
 194         get_cpu_var(*pgto_ptr__) op val;                                \
 195         put_cpu_var(*pgto_ptr__);                                       \
 196 } while (0)
 197
 198 #ifndef percpu_write
 199 # define percpu_write(var, val)         __percpu_generic_to_op(var, (val), =)
 200 #endif
 201
 202 #ifndef percpu_add
 203 # define percpu_add(var, val)           __percpu_generic_to_op(var, (val), +=)
 204 #endif
 205
 206 #ifndef percpu_sub
 207 # define percpu_sub(var, val)           __percpu_generic_to_op(var, (val), -=)
 208 #endif
 209
 210 #ifndef percpu_and
 211 # define percpu_and(var, val)           __percpu_generic_to_op(var, (val), &=)
 212 #endif
 213
 214 #ifndef percpu_or
 215 # define percpu_or(var, val)            __percpu_generic_to_op(var, (val), |=)
 216 #endif
 217
 218 #ifndef percpu_xor
 219 # define percpu_xor(var, val)           __percpu_generic_to_op(var, (val), ^=)
 220 #endif
 221
 222 /*
 223  * Branching function to split up a function into a set of functions that
 224  * are called for different scalar sizes of the objects handled.
 225  */
 226
 227 extern void __bad_size_call_parameter(void);
 228
 229 #define __pcpu_size_call_return(stem, variable)                         \
 230 ({      typeof(variable) pscr_ret__;                                    \
 231         __verify_pcpu_ptr(&(variable));                                 \
 232         switch(sizeof(variable)) {                                      \
 233         case 1: pscr_ret__ = stem##1(variable);break;                   \
 234         case 2: pscr_ret__ = stem##2(variable);break;                   \
 235         case 4: pscr_ret__ = stem##4(variable);break;                   \
 236         case 8: pscr_ret__ = stem##8(variable);break;                   \
 237         default:                                                        \
 238                 __bad_size_call_parameter();break;                      \
 239         }                                                               \
 240         pscr_ret__;                                                     \
 241 })
 242
 243 #define __pcpu_size_call_return2(stem, variable, ...)                   \
 244 ({                                                                      \
 245         typeof(variable) pscr2_ret__;                                   \
 246         __verify_pcpu_ptr(&(variable));                                 \
 247         switch(sizeof(variable)) {                                      \
 248         case 1: pscr2_ret__ = stem##1(variable, __VA_ARGS__); break;    \
 249         case 2: pscr2_ret__ = stem##2(variable, __VA_ARGS__); break;    \
 250         case 4: pscr2_ret__ = stem##4(variable, __VA_ARGS__); break;    \
 251         case 8: pscr2_ret__ = stem##8(variable, __VA_ARGS__); break;    \
 252         default:                                                        \
 253                 __bad_size_call_parameter(); break;                     \
 254         }                                                               \
 255         pscr2_ret__;                                                    \
 256 })
 257
 258 /*
 259  * Special handling for cmpxchg_double.  cmpxchg_double is passed two
 260  * percpu variables.  The first has to be aligned to a double word
 261  * boundary and the second has to follow directly thereafter.
 262  * We enforce this on all architectures even if they don't support
 263  * a double cmpxchg instruction, since it's a cheap requirement, and it
 264  * avoids breaking the requirement for architectures with the instruction.
 265  */
 266 #define __pcpu_double_call_return_bool(stem, pcp1, pcp2, ...)           \
 267 ({                                                                      \
 268         bool pdcrb_ret__;                                               \
 269         __verify_pcpu_ptr(&pcp1);                                       \
 270         BUILD_BUG_ON(sizeof(pcp1) != sizeof(pcp2));                     \
 271         VM_BUG_ON((unsigned long)(&pcp1) % (2 * sizeof(pcp1)));         \
 272         VM_BUG_ON((unsigned long)(&pcp2) !=                             \
 273                   (unsigned long)(&pcp1) + sizeof(pcp1));               \
 274         switch(sizeof(pcp1)) {                                          \
 275         case 1: pdcrb_ret__ = stem##1(pcp1, pcp2, __VA_ARGS__); break;  \
 276         case 2: pdcrb_ret__ = stem##2(pcp1, pcp2, __VA_ARGS__); break;  \
 277         case 4: pdcrb_ret__ = stem##4(pcp1, pcp2, __VA_ARGS__); break;  \
 278         case 8: pdcrb_ret__ = stem##8(pcp1, pcp2, __VA_ARGS__); break;  \
 279         default:                                                        \
 280                 __bad_size_call_parameter(); break;                     \
 281         }                                                               \
 282         pdcrb_ret__;                                                    \
 283 })
 284
 285 #define __pcpu_size_call(stem, variable, ...)                           \
 286 do {                                                                    \
 287         __verify_pcpu_ptr(&(variable));                                 \
 288         switch(sizeof(variable)) {                                      \
 289                 case 1: stem##1(variable, __VA_ARGS__);break;           \
 290                 case 2: stem##2(variable, __VA_ARGS__);break;           \
 291                 case 4: stem##4(variable, __VA_ARGS__);break;           \
 292                 case 8: stem##8(variable, __VA_ARGS__);break;           \
 293                 default:                                                \
 294                         __bad_size_call_parameter();break;              \
 295         }                                                               \
 296 } while (0)
 297
 298 /*
 299  * Optimized manipulation for memory allocated through the per cpu
 300  * allocator or for addresses of per cpu variables.
 301  *
 302  * These operation guarantee exclusivity of access for other operations
 303  * on the *same* processor. The assumption is that per cpu data is only
 304  * accessed by a single processor instance (the current one).
 305  *
 306  * The first group is used for accesses that must be done in a
 307  * preemption safe way since we know that the context is not preempt
 308  * safe. Interrupts may occur. If the interrupt modifies the variable
 309  * too then RMW actions will not be reliable.
 310  *
 311  * The arch code can provide optimized functions in two ways:
 312  *
 313  * 1. Override the function completely. F.e. define this_cpu_add().
 314  *    The arch must then ensure that the various scalar format passed
 315  *    are handled correctly.
 316  *
 317  * 2. Provide functions for certain scalar sizes. F.e. provide
 318  *    this_cpu_add_2() to provide per cpu atomic operations for 2 byte
 319  *    sized RMW actions. If arch code does not provide operations for
 320  *    a scalar size then the fallback in the generic code will be
 321  *    used.
 322  */
 323
 324 #define _this_cpu_generic_read(pcp)                                     \
 325 ({      typeof(pcp) ret__;                                              \
 326         preempt_disable();                                              \
 327         ret__ = *this_cpu_ptr(&(pcp));                                  \
 328         preempt_enable();                                               \
 329         ret__;                                                          \
 330 })
 331
 332 #ifndef this_cpu_read
 333 # ifndef this_cpu_read_1
 334 #  define this_cpu_read_1(pcp)  _this_cpu_generic_read(pcp)
 335 # endif
 336 # ifndef this_cpu_read_2
 337 #  define this_cpu_read_2(pcp)  _this_cpu_generic_read(pcp)
 338 # endif
 339 # ifndef this_cpu_read_4
 340 #  define this_cpu_read_4(pcp)  _this_cpu_generic_read(pcp)
 341 # endif
 342 # ifndef this_cpu_read_8
 343 #  define this_cpu_read_8(pcp)  _this_cpu_generic_read(pcp)
 344 # endif
 345 # define this_cpu_read(pcp)     __pcpu_size_call_return(this_cpu_read_, (pcp))
 346 #endif
 347
 348 #define _this_cpu_generic_to_op(pcp, val, op)                           \
 349 do {                                                                    \
 350         preempt_disable();                                              \
 351         *__this_cpu_ptr(&(pcp)) op val;                                 \
 352         preempt_enable();                                               \
 353 } while (0)
 354
 355 #ifndef this_cpu_write
 356 # ifndef this_cpu_write_1
 357 #  define this_cpu_write_1(pcp, val)    _this_cpu_generic_to_op((pcp), (val), =)
 358 # endif
 359 # ifndef this_cpu_write_2
 360 #  define this_cpu_write_2(pcp, val)    _this_cpu_generic_to_op((pcp), (val), =)
 361 # endif
 362 # ifndef this_cpu_write_4
 363 #  define this_cpu_write_4(pcp, val)    _this_cpu_generic_to_op((pcp), (val), =)
 364 # endif
 365 # ifndef this_cpu_write_8
 366 #  define this_cpu_write_8(pcp, val)    _this_cpu_generic_to_op((pcp), (val), =)
 367 # endif
 368 # define this_cpu_write(pcp, val)       __pcpu_size_call(this_cpu_write_, (pcp), (val))
 369 #endif
 370
 371 #ifndef this_cpu_add
 372 # ifndef this_cpu_add_1
 373 #  define this_cpu_add_1(pcp, val)      _this_cpu_generic_to_op((pcp), (val), +=)
 374 # endif
 375 # ifndef this_cpu_add_2
 376 #  define this_cpu_add_2(pcp, val)      _this_cpu_generic_to_op((pcp), (val), +=)
 377 # endif
 378 # ifndef this_cpu_add_4
 379 #  define this_cpu_add_4(pcp, val)      _this_cpu_generic_to_op((pcp), (val), +=)
 380 # endif
 381 # ifndef this_cpu_add_8
 382 #  define this_cpu_add_8(pcp, val)      _this_cpu_generic_to_op((pcp), (val), +=)
 383 # endif
 384 # define this_cpu_add(pcp, val)         __pcpu_size_call(this_cpu_add_, (pcp), (val))
 385 #endif
 386
 387 #ifndef this_cpu_sub
 388 # define this_cpu_sub(pcp, val)         this_cpu_add((pcp), -(val))
 389 #endif
 390
 391 #ifndef this_cpu_inc
 392 # define this_cpu_inc(pcp)              this_cpu_add((pcp), 1)
 393 #endif
 394
 395 #ifndef this_cpu_dec
 396 # define this_cpu_dec(pcp)              this_cpu_sub((pcp), 1)
 397 #endif
 398
 399 #ifndef this_cpu_and
 400 # ifndef this_cpu_and_1
 401 #  define this_cpu_and_1(pcp, val)      _this_cpu_generic_to_op((pcp), (val), &=)
 402 # endif
 403 # ifndef this_cpu_and_2
 404 #  define this_cpu_and_2(pcp, val)      _this_cpu_generic_to_op((pcp), (val), &=)
 405 # endif
 406 # ifndef this_cpu_and_4
 407 #  define this_cpu_and_4(pcp, val)      _this_cpu_generic_to_op((pcp), (val), &=)
 408 # endif
 409 # ifndef this_cpu_and_8
 410 #  define this_cpu_and_8(pcp, val)      _this_cpu_generic_to_op((pcp), (val), &=)
 411 # endif
 412 # define this_cpu_and(pcp, val)         __pcpu_size_call(this_cpu_and_, (pcp), (val))
 413 #endif
 414
 415 #ifndef this_cpu_or
 416 # ifndef this_cpu_or_1
 417 #  define this_cpu_or_1(pcp, val)       _this_cpu_generic_to_op((pcp), (val), |=)
 418 # endif
 419 # ifndef this_cpu_or_2
 420 #  define this_cpu_or_2(pcp, val)       _this_cpu_generic_to_op((pcp), (val), |=)
 421 # endif
 422 # ifndef this_cpu_or_4
 423 #  define this_cpu_or_4(pcp, val)       _this_cpu_generic_to_op((pcp), (val), |=)
 424 # endif
 425 # ifndef this_cpu_or_8
 426 #  define this_cpu_or_8(pcp, val)       _this_cpu_generic_to_op((pcp), (val), |=)
 427 # endif
 428 # define this_cpu_or(pcp, val)          __pcpu_size_call(this_cpu_or_, (pcp), (val))
 429 #endif
 430
 431 #ifndef this_cpu_xor
 432 # ifndef this_cpu_xor_1
 433 #  define this_cpu_xor_1(pcp, val)      _this_cpu_generic_to_op((pcp), (val), ^=)
 434 # endif
 435 # ifndef this_cpu_xor_2
 436 #  define this_cpu_xor_2(pcp, val)      _this_cpu_generic_to_op((pcp), (val), ^=)
 437 # endif
 438 # ifndef this_cpu_xor_4
 439 #  define this_cpu_xor_4(pcp, val)      _this_cpu_generic_to_op((pcp), (val), ^=)
 440 # endif
 441 # ifndef this_cpu_xor_8
 442 #  define this_cpu_xor_8(pcp, val)      _this_cpu_generic_to_op((pcp), (val), ^=)
 443 # endif
 444 # define this_cpu_xor(pcp, val)         __pcpu_size_call(this_cpu_or_, (pcp), (val))
 445 #endif
 446
 447 #define _this_cpu_generic_add_return(pcp, val)                          \
 448 ({                                                                      \
 449         typeof(pcp) ret__;                                              \
 450         preempt_disable();                                              \
 451         __this_cpu_add(pcp, val);                                       \
 452         ret__ = __this_cpu_read(pcp);                                   \
 453         preempt_enable();                                               \
 454         ret__;                                                          \
 455 })
 456
 457 #ifndef this_cpu_add_return
 458 # ifndef this_cpu_add_return_1
 459 #  define this_cpu_add_return_1(pcp, val)       _this_cpu_generic_add_return(pcp, val)
 460 # endif
 461 # ifndef this_cpu_add_return_2
 462 #  define this_cpu_add_return_2(pcp, val)       _this_cpu_generic_add_return(pcp, val)
 463 # endif
 464 # ifndef this_cpu_add_return_4
 465 #  define this_cpu_add_return_4(pcp, val)       _this_cpu_generic_add_return(pcp, val)
 466 # endif
 467 # ifndef this_cpu_add_return_8
 468 #  define this_cpu_add_return_8(pcp, val)       _this_cpu_generic_add_return(pcp, val)
 469 # endif
 470 # define this_cpu_add_return(pcp, val)  __pcpu_size_call_return2(this_cpu_add_return_, pcp, val)
 471 #endif
 472
 473 #define this_cpu_sub_return(pcp, val)   this_cpu_add_return(pcp, -(val))
 474 #define this_cpu_inc_return(pcp)        this_cpu_add_return(pcp, 1)
 475 #define this_cpu_dec_return(pcp)        this_cpu_add_return(pcp, -1)
 476
 477 #define _this_cpu_generic_xchg(pcp, nval)                               \
 478 ({      typeof(pcp) ret__;                                              \
 479         preempt_disable();                                              \
 480         ret__ = __this_cpu_read(pcp);                                   \
 481         __this_cpu_write(pcp, nval);                                    \
 482         preempt_enable();                                               \
 483         ret__;                                                          \
 484 })
 485
 486 #ifndef this_cpu_xchg
 487 # ifndef this_cpu_xchg_1
 488 #  define this_cpu_xchg_1(pcp, nval)    _this_cpu_generic_xchg(pcp, nval)
 489 # endif
 490 # ifndef this_cpu_xchg_2
 491 #  define this_cpu_xchg_2(pcp, nval)    _this_cpu_generic_xchg(pcp, nval)
 492 # endif
 493 # ifndef this_cpu_xchg_4
 494 #  define this_cpu_xchg_4(pcp, nval)    _this_cpu_generic_xchg(pcp, nval)
 495 # endif
 496 # ifndef this_cpu_xchg_8
 497 #  define this_cpu_xchg_8(pcp, nval)    _this_cpu_generic_xchg(pcp, nval)
 498 # endif
 499 # define this_cpu_xchg(pcp, nval)       \
 500         __pcpu_size_call_return2(this_cpu_xchg_, (pcp), nval)
 501 #endif
 502
 503 #define _this_cpu_generic_cmpxchg(pcp, oval, nval)                      \
 504 ({      typeof(pcp) ret__;                                              \
 505         preempt_disable();                                              \
 506         ret__ = __this_cpu_read(pcp);                                   \
 507         if (ret__ == (oval))                                            \
 508                 __this_cpu_write(pcp, nval);                            \
 509         preempt_enable();                                               \
 510         ret__;                                                          \
 511 })
 512
 513 #ifndef this_cpu_cmpxchg
 514 # ifndef this_cpu_cmpxchg_1
 515 #  define this_cpu_cmpxchg_1(pcp, oval, nval)   _this_cpu_generic_cmpxchg(pcp, oval, nval)
 516 # endif
 517 # ifndef this_cpu_cmpxchg_2
 518 #  define this_cpu_cmpxchg_2(pcp, oval, nval)   _this_cpu_generic_cmpxchg(pcp, oval, nval)
 519 # endif
 520 # ifndef this_cpu_cmpxchg_4
 521 #  define this_cpu_cmpxchg_4(pcp, oval, nval)   _this_cpu_generic_cmpxchg(pcp, oval, nval)
 522 # endif
 523 # ifndef this_cpu_cmpxchg_8
 524 #  define this_cpu_cmpxchg_8(pcp, oval, nval)   _this_cpu_generic_cmpxchg(pcp, oval, nval)
 525 # endif
 526 # define this_cpu_cmpxchg(pcp, oval, nval)      \
 527         __pcpu_size_call_return2(this_cpu_cmpxchg_, pcp, oval, nval)
 528 #endif
 529
 530 /*
 531  * cmpxchg_double replaces two adjacent scalars at once.  The first
 532  * two parameters are per cpu variables which have to be of the same
 533  * size.  A truth value is returned to indicate success or failure
 534  * (since a double register result is difficult to handle).  There is
 535  * very limited hardware support for these operations, so only certain
 536  * sizes may work.
 537  */
 538 #define _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)        \
 539 ({                                                                      \
 540         int ret__;                                                      \
 541         preempt_disable();                                              \
 542         ret__ = __this_cpu_generic_cmpxchg_double(pcp1, pcp2,           \
 543                         oval1, oval2, nval1, nval2);                    \
 544         preempt_enable();                                               \
 545         ret__;                                                          \
 546 })
 547
 548 #ifndef this_cpu_cmpxchg_double
 549 # ifndef this_cpu_cmpxchg_double_1
 550 #  define this_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2)     \
 551         _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 552 # endif
 553 # ifndef this_cpu_cmpxchg_double_2
 554 #  define this_cpu_cmpxchg_double_2(pcp1, pcp2, oval1, oval2, nval1, nval2)     \
 555         _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 556 # endif
 557 # ifndef this_cpu_cmpxchg_double_4
 558 #  define this_cpu_cmpxchg_double_4(pcp1, pcp2, oval1, oval2, nval1, nval2)     \
 559         _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 560 # endif
 561 # ifndef this_cpu_cmpxchg_double_8
 562 #  define this_cpu_cmpxchg_double_8(pcp1, pcp2, oval1, oval2, nval1, nval2)     \
 563         _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 564 # endif
 565 # define this_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)        \
 566         __pcpu_double_call_return_bool(this_cpu_cmpxchg_double_, (pcp1), (pcp2), (oval1), (oval2), (nval1), (nval2))
 567 #endif
 568
 569 /*
 570  * Generic percpu operations that do not require preemption handling.
 571  * Either we do not care about races or the caller has the
 572  * responsibility of handling preemptions issues. Arch code can still
 573  * override these instructions since the arch per cpu code may be more
 574  * efficient and may actually get race freeness for free (that is the
 575  * case for x86 for example).
 576  *
 577  * If there is no other protection through preempt disable and/or
 578  * disabling interupts then one of these RMW operations can show unexpected
 579  * behavior because the execution thread was rescheduled on another processor
 580  * or an interrupt occurred and the same percpu variable was modified from
 581  * the interrupt context.
 582  */
 583 #ifndef __this_cpu_read
 584 # ifndef __this_cpu_read_1
 585 #  define __this_cpu_read_1(pcp)        (*__this_cpu_ptr(&(pcp)))
 586 # endif
 587 # ifndef __this_cpu_read_2
 588 #  define __this_cpu_read_2(pcp)        (*__this_cpu_ptr(&(pcp)))
 589 # endif
 590 # ifndef __this_cpu_read_4
 591 #  define __this_cpu_read_4(pcp)        (*__this_cpu_ptr(&(pcp)))
 592 # endif
 593 # ifndef __this_cpu_read_8
 594 #  define __this_cpu_read_8(pcp)        (*__this_cpu_ptr(&(pcp)))
 595 # endif
 596 # define __this_cpu_read(pcp)   __pcpu_size_call_return(__this_cpu_read_, (pcp))
 597 #endif
 598
 599 #define __this_cpu_generic_to_op(pcp, val, op)                          \
 600 do {                                                                    \
 601         *__this_cpu_ptr(&(pcp)) op val;                                 \
 602 } while (0)
 603
 604 #ifndef __this_cpu_write
 605 # ifndef __this_cpu_write_1
 606 #  define __this_cpu_write_1(pcp, val)  __this_cpu_generic_to_op((pcp), (val), =)
 607 # endif
 608 # ifndef __this_cpu_write_2
 609 #  define __this_cpu_write_2(pcp, val)  __this_cpu_generic_to_op((pcp), (val), =)
 610 # endif
 611 # ifndef __this_cpu_write_4
 612 #  define __this_cpu_write_4(pcp, val)  __this_cpu_generic_to_op((pcp), (val), =)
 613 # endif
 614 # ifndef __this_cpu_write_8
 615 #  define __this_cpu_write_8(pcp, val)  __this_cpu_generic_to_op((pcp), (val), =)
 616 # endif
 617 # define __this_cpu_write(pcp, val)     __pcpu_size_call(__this_cpu_write_, (pcp), (val))
 618 #endif
 619
 620 #ifndef __this_cpu_add
 621 # ifndef __this_cpu_add_1
 622 #  define __this_cpu_add_1(pcp, val)    __this_cpu_generic_to_op((pcp), (val), +=)
 623 # endif
 624 # ifndef __this_cpu_add_2
 625 #  define __this_cpu_add_2(pcp, val)    __this_cpu_generic_to_op((pcp), (val), +=)
 626 # endif
 627 # ifndef __this_cpu_add_4
 628 #  define __this_cpu_add_4(pcp, val)    __this_cpu_generic_to_op((pcp), (val), +=)
 629 # endif
 630 # ifndef __this_cpu_add_8
 631 #  define __this_cpu_add_8(pcp, val)    __this_cpu_generic_to_op((pcp), (val), +=)
 632 # endif
 633 # define __this_cpu_add(pcp, val)       __pcpu_size_call(__this_cpu_add_, (pcp), (val))
 634 #endif
 635
 636 #ifndef __this_cpu_sub
 637 # define __this_cpu_sub(pcp, val)       __this_cpu_add((pcp), -(val))
 638 #endif
 639
 640 #ifndef __this_cpu_inc
 641 # define __this_cpu_inc(pcp)            __this_cpu_add((pcp), 1)
 642 #endif
 643
 644 #ifndef __this_cpu_dec
 645 # define __this_cpu_dec(pcp)            __this_cpu_sub((pcp), 1)
 646 #endif
 647
 648 #ifndef __this_cpu_and
 649 # ifndef __this_cpu_and_1
 650 #  define __this_cpu_and_1(pcp, val)    __this_cpu_generic_to_op((pcp), (val), &=)
 651 # endif
 652 # ifndef __this_cpu_and_2
 653 #  define __this_cpu_and_2(pcp, val)    __this_cpu_generic_to_op((pcp), (val), &=)
 654 # endif
 655 # ifndef __this_cpu_and_4
 656 #  define __this_cpu_and_4(pcp, val)    __this_cpu_generic_to_op((pcp), (val), &=)
 657 # endif
 658 # ifndef __this_cpu_and_8
 659 #  define __this_cpu_and_8(pcp, val)    __this_cpu_generic_to_op((pcp), (val), &=)
 660 # endif
 661 # define __this_cpu_and(pcp, val)       __pcpu_size_call(__this_cpu_and_, (pcp), (val))
 662 #endif
 663
 664 #ifndef __this_cpu_or
 665 # ifndef __this_cpu_or_1
 666 #  define __this_cpu_or_1(pcp, val)     __this_cpu_generic_to_op((pcp), (val), |=)
 667 # endif
 668 # ifndef __this_cpu_or_2
 669 #  define __this_cpu_or_2(pcp, val)     __this_cpu_generic_to_op((pcp), (val), |=)
 670 # endif
 671 # ifndef __this_cpu_or_4
 672 #  define __this_cpu_or_4(pcp, val)     __this_cpu_generic_to_op((pcp), (val), |=)
 673 # endif
 674 # ifndef __this_cpu_or_8
 675 #  define __this_cpu_or_8(pcp, val)     __this_cpu_generic_to_op((pcp), (val), |=)
 676 # endif
 677 # define __this_cpu_or(pcp, val)        __pcpu_size_call(__this_cpu_or_, (pcp), (val))
 678 #endif
 679
 680 #ifndef __this_cpu_xor
 681 # ifndef __this_cpu_xor_1
 682 #  define __this_cpu_xor_1(pcp, val)    __this_cpu_generic_to_op((pcp), (val), ^=)
 683 # endif
 684 # ifndef __this_cpu_xor_2
 685 #  define __this_cpu_xor_2(pcp, val)    __this_cpu_generic_to_op((pcp), (val), ^=)
 686 # endif
 687 # ifndef __this_cpu_xor_4
 688 #  define __this_cpu_xor_4(pcp, val)    __this_cpu_generic_to_op((pcp), (val), ^=)
 689 # endif
 690 # ifndef __this_cpu_xor_8
 691 #  define __this_cpu_xor_8(pcp, val)    __this_cpu_generic_to_op((pcp), (val), ^=)
 692 # endif
 693 # define __this_cpu_xor(pcp, val)       __pcpu_size_call(__this_cpu_xor_, (pcp), (val))
 694 #endif
 695
 696 #define __this_cpu_generic_add_return(pcp, val)                         \
 697 ({                                                                      \
 698         __this_cpu_add(pcp, val);                                       \
 699         __this_cpu_read(pcp);                                           \
 700 })
 701
 702 #ifndef __this_cpu_add_return
 703 # ifndef __this_cpu_add_return_1
 704 #  define __this_cpu_add_return_1(pcp, val)     __this_cpu_generic_add_return(pcp, val)
 705 # endif
 706 # ifndef __this_cpu_add_return_2
 707 #  define __this_cpu_add_return_2(pcp, val)     __this_cpu_generic_add_return(pcp, val)
 708 # endif
 709 # ifndef __this_cpu_add_return_4
 710 #  define __this_cpu_add_return_4(pcp, val)     __this_cpu_generic_add_return(pcp, val)
 711 # endif
 712 # ifndef __this_cpu_add_return_8
 713 #  define __this_cpu_add_return_8(pcp, val)     __this_cpu_generic_add_return(pcp, val)
 714 # endif
 715 # define __this_cpu_add_return(pcp, val)        __pcpu_size_call_return2(this_cpu_add_return_, pcp, val)
 716 #endif
 717
 718 #define __this_cpu_sub_return(pcp, val) this_cpu_add_return(pcp, -(val))
 719 #define __this_cpu_inc_return(pcp)      this_cpu_add_return(pcp, 1)
 720 #define __this_cpu_dec_return(pcp)      this_cpu_add_return(pcp, -1)
 721
 722 #define __this_cpu_generic_xchg(pcp, nval)                              \
 723 ({      typeof(pcp) ret__;                                              \
 724         ret__ = __this_cpu_read(pcp);                                   \
 725         __this_cpu_write(pcp, nval);                                    \
 726         ret__;                                                          \
 727 })
 728
 729 #ifndef __this_cpu_xchg
 730 # ifndef __this_cpu_xchg_1
 731 #  define __this_cpu_xchg_1(pcp, nval)  __this_cpu_generic_xchg(pcp, nval)
 732 # endif
 733 # ifndef __this_cpu_xchg_2
 734 #  define __this_cpu_xchg_2(pcp, nval)  __this_cpu_generic_xchg(pcp, nval)
 735 # endif
 736 # ifndef __this_cpu_xchg_4
 737 #  define __this_cpu_xchg_4(pcp, nval)  __this_cpu_generic_xchg(pcp, nval)
 738 # endif
 739 # ifndef __this_cpu_xchg_8
 740 #  define __this_cpu_xchg_8(pcp, nval)  __this_cpu_generic_xchg(pcp, nval)
 741 # endif
 742 # define __this_cpu_xchg(pcp, nval)     \
 743         __pcpu_size_call_return2(__this_cpu_xchg_, (pcp), nval)
 744 #endif
 745
 746 #define __this_cpu_generic_cmpxchg(pcp, oval, nval)                     \
 747 ({                                                                      \
 748         typeof(pcp) ret__;                                              \
 749         ret__ = __this_cpu_read(pcp);                                   \
 750         if (ret__ == (oval))                                            \
 751                 __this_cpu_write(pcp, nval);                            \
 752         ret__;                                                          \
 753 })
 754
 755 #ifndef __this_cpu_cmpxchg
 756 # ifndef __this_cpu_cmpxchg_1
 757 #  define __this_cpu_cmpxchg_1(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval)
 758 # endif
 759 # ifndef __this_cpu_cmpxchg_2
 760 #  define __this_cpu_cmpxchg_2(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval)
 761 # endif
 762 # ifndef __this_cpu_cmpxchg_4
 763 #  define __this_cpu_cmpxchg_4(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval)
 764 # endif
 765 # ifndef __this_cpu_cmpxchg_8
 766 #  define __this_cpu_cmpxchg_8(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval)
 767 # endif
 768 # define __this_cpu_cmpxchg(pcp, oval, nval)    \
 769         __pcpu_size_call_return2(__this_cpu_cmpxchg_, pcp, oval, nval)
 770 #endif
 771
 772 #define __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)       \
 773 ({                                                                      \
 774         int __ret = 0;                                                  \
 775         if (__this_cpu_read(pcp1) == (oval1) &&                         \
 776                          __this_cpu_read(pcp2)  == (oval2)) {           \
 777                 __this_cpu_write(pcp1, (nval1));                        \
 778                 __this_cpu_write(pcp2, (nval2));                        \
 779                 __ret = 1;                                              \
 780         }                                                               \
 781         (__ret);                                                        \
 782 })
 783
 784 #ifndef __this_cpu_cmpxchg_double
 785 # ifndef __this_cpu_cmpxchg_double_1
 786 #  define __this_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2)   \
 787         __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 788 # endif
 789 # ifndef __this_cpu_cmpxchg_double_2
 790 #  define __this_cpu_cmpxchg_double_2(pcp1, pcp2, oval1, oval2, nval1, nval2)   \
 791         __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 792 # endif
 793 # ifndef __this_cpu_cmpxchg_double_4
 794 #  define __this_cpu_cmpxchg_double_4(pcp1, pcp2, oval1, oval2, nval1, nval2)   \
 795         __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 796 # endif
 797 # ifndef __this_cpu_cmpxchg_double_8
 798 #  define __this_cpu_cmpxchg_double_8(pcp1, pcp2, oval1, oval2, nval1, nval2)   \
 799         __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 800 # endif
 801 # define __this_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)      \
 802         __pcpu_double_call_return_bool(__this_cpu_cmpxchg_double_, (pcp1), (pcp2), (oval1), (oval2), (nval1), (nval2))
 803 #endif
 804
 805 /*
 806  * IRQ safe versions of the per cpu RMW operations. Note that these operations
 807  * are *not* safe against modification of the same variable from another
 808  * processors (which one gets when using regular atomic operations)
 809  * They are guaranteed to be atomic vs. local interrupts and
 810  * preemption only.
 811  */
 812 #define irqsafe_cpu_generic_to_op(pcp, val, op)                         \
 813 do {                                                                    \
 814         unsigned long flags;                                            \
 815         local_irq_save(flags);                                          \
 816         *__this_cpu_ptr(&(pcp)) op val;                                 \
 817         local_irq_restore(flags);                                       \
 818 } while (0)
 819
 820 #ifndef irqsafe_cpu_add
 821 # ifndef irqsafe_cpu_add_1
 822 #  define irqsafe_cpu_add_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=)
 823 # endif
 824 # ifndef irqsafe_cpu_add_2
 825 #  define irqsafe_cpu_add_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=)
 826 # endif
 827 # ifndef irqsafe_cpu_add_4
 828 #  define irqsafe_cpu_add_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=)
 829 # endif
 830 # ifndef irqsafe_cpu_add_8
 831 #  define irqsafe_cpu_add_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=)
 832 # endif
 833 # define irqsafe_cpu_add(pcp, val) __pcpu_size_call(irqsafe_cpu_add_, (pcp), (val))
 834 #endif
 835
 836 #ifndef irqsafe_cpu_sub
 837 # define irqsafe_cpu_sub(pcp, val)      irqsafe_cpu_add((pcp), -(val))
 838 #endif
 839
 840 #ifndef irqsafe_cpu_inc
 841 # define irqsafe_cpu_inc(pcp)   irqsafe_cpu_add((pcp), 1)
 842 #endif
 843
 844 #ifndef irqsafe_cpu_dec
 845 # define irqsafe_cpu_dec(pcp)   irqsafe_cpu_sub((pcp), 1)
 846 #endif
 847
 848 #ifndef irqsafe_cpu_and
 849 # ifndef irqsafe_cpu_and_1
 850 #  define irqsafe_cpu_and_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=)
 851 # endif
 852 # ifndef irqsafe_cpu_and_2
 853 #  define irqsafe_cpu_and_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=)
 854 # endif
 855 # ifndef irqsafe_cpu_and_4
 856 #  define irqsafe_cpu_and_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=)
 857 # endif
 858 # ifndef irqsafe_cpu_and_8
 859 #  define irqsafe_cpu_and_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=)
 860 # endif
 861 # define irqsafe_cpu_and(pcp, val) __pcpu_size_call(irqsafe_cpu_and_, (val))
 862 #endif
 863
 864 #ifndef irqsafe_cpu_or
 865 # ifndef irqsafe_cpu_or_1
 866 #  define irqsafe_cpu_or_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=)
 867 # endif
 868 # ifndef irqsafe_cpu_or_2
 869 #  define irqsafe_cpu_or_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=)
 870 # endif
 871 # ifndef irqsafe_cpu_or_4
 872 #  define irqsafe_cpu_or_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=)
 873 # endif
 874 # ifndef irqsafe_cpu_or_8
 875 #  define irqsafe_cpu_or_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=)
 876 # endif
 877 # define irqsafe_cpu_or(pcp, val) __pcpu_size_call(irqsafe_cpu_or_, (val))
 878 #endif
 879
 880 #ifndef irqsafe_cpu_xor
 881 # ifndef irqsafe_cpu_xor_1
 882 #  define irqsafe_cpu_xor_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=)
 883 # endif
 884 # ifndef irqsafe_cpu_xor_2
 885 #  define irqsafe_cpu_xor_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=)
 886 # endif
 887 # ifndef irqsafe_cpu_xor_4
 888 #  define irqsafe_cpu_xor_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=)
 889 # endif
 890 # ifndef irqsafe_cpu_xor_8
 891 #  define irqsafe_cpu_xor_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=)
 892 # endif
 893 # define irqsafe_cpu_xor(pcp, val) __pcpu_size_call(irqsafe_cpu_xor_, (val))
 894 #endif
 895
 896 #define irqsafe_cpu_generic_cmpxchg(pcp, oval, nval)                    \
 897 ({                                                                      \
 898         typeof(pcp) ret__;                                              \
 899         unsigned long flags;                                            \
 900         local_irq_save(flags);                                          \
 901         ret__ = __this_cpu_read(pcp);                                   \
 902         if (ret__ == (oval))                                            \
 903                 __this_cpu_write(pcp, nval);                            \
 904         local_irq_restore(flags);                                       \
 905         ret__;                                                          \
 906 })
 907
 908 #ifndef irqsafe_cpu_cmpxchg
 909 # ifndef irqsafe_cpu_cmpxchg_1
 910 #  define irqsafe_cpu_cmpxchg_1(pcp, oval, nval)        irqsafe_cpu_generic_cmpxchg(pcp, oval, nval)
 911 # endif
 912 # ifndef irqsafe_cpu_cmpxchg_2
 913 #  define irqsafe_cpu_cmpxchg_2(pcp, oval, nval)        irqsafe_cpu_generic_cmpxchg(pcp, oval, nval)
 914 # endif
 915 # ifndef irqsafe_cpu_cmpxchg_4
 916 #  define irqsafe_cpu_cmpxchg_4(pcp, oval, nval)        irqsafe_cpu_generic_cmpxchg(pcp, oval, nval)
 917 # endif
 918 # ifndef irqsafe_cpu_cmpxchg_8
 919 #  define irqsafe_cpu_cmpxchg_8(pcp, oval, nval)        irqsafe_cpu_generic_cmpxchg(pcp, oval, nval)
 920 # endif
 921 # define irqsafe_cpu_cmpxchg(pcp, oval, nval)           \
 922         __pcpu_size_call_return2(irqsafe_cpu_cmpxchg_, (pcp), oval, nval)
 923 #endif
 924
 925 #define irqsafe_generic_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)      \
 926 ({                                                                      \
 927         int ret__;                                                      \
 928         unsigned long flags;                                            \
 929         local_irq_save(flags);                                          \
 930         ret__ = __this_cpu_generic_cmpxchg_double(pcp1, pcp2,           \
 931                         oval1, oval2, nval1, nval2);                    \
 932         local_irq_restore(flags);                                       \
 933         ret__;                                                          \
 934 })
 935
 936 #ifndef irqsafe_cpu_cmpxchg_double
 937 # ifndef irqsafe_cpu_cmpxchg_double_1
 938 #  define irqsafe_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2)  \
 939         irqsafe_generic_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 940 # endif
 941 # ifndef irqsafe_cpu_cmpxchg_double_2
 942 #  define irqsafe_cpu_cmpxchg_double_2(pcp1, pcp2, oval1, oval2, nval1, nval2)  \
 943         irqsafe_generic_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 944 # endif
 945 # ifndef irqsafe_cpu_cmpxchg_double_4
 946 #  define irqsafe_cpu_cmpxchg_double_4(pcp1, pcp2, oval1, oval2, nval1, nval2)  \
 947         irqsafe_generic_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 948 # endif
 949 # ifndef irqsafe_cpu_cmpxchg_double_8
 950 #  define irqsafe_cpu_cmpxchg_double_8(pcp1, pcp2, oval1, oval2, nval1, nval2)  \
 951         irqsafe_generic_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 952 # endif
 953 # define irqsafe_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)     \
 954         __pcpu_double_call_return_bool(irqsafe_cpu_cmpxchg_double_, (pcp1), (pcp2), (oval1), (oval2), (nval1), (nval2))
 955 #endif
 956
 957 #endif /* __LINUX_PERCPU_H */